Methylene
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A hydrocarbon radical, CH2, not known in the free state, butregarded as an essential residue and component of certain derivativesof methane; as, methylene bromide, CH2Br2; -- formerly called alsomethene. Methylene blue (Chem.), an artificial dyestuff consisting ofa complex sulphur derivative of diphenyl amine; -- called also pureblue.
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